Secret; private

hội kín

secret society

Tight

đóng kín

to close tight

blind

blind wall building

bottletight

cap nut

close

closed

dense

dumb

enclosed

hermetic

Giải thích VN: Làm kín hơi …bằng phương pháp nấu [[chảy. ]]

Giải thích EN: Made airtight, e.g., by fusion or scaling.

hermetic (al)

impermeable

leak-free

leakless

leak-proof

leak-tight

locked

proof

sealed

sealing

shut

sound

tight

windproof